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    Subject[PATCH v2 12/19] vhost-vdpa: introduce uAPI to get the number of address spaces
    Date
    This patch introduces the uAPI for getting the number of address
    spaces supported by this vDPA device.

    Signed-off-by: Jason Wang <jasowang@redhat.com>
    Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
    ---
    drivers/vhost/vdpa.c | 3 +++
    include/uapi/linux/vhost.h | 2 ++
    2 files changed, 5 insertions(+)

    diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
    index 92f78df0f685..a017011ad1f5 100644
    --- a/drivers/vhost/vdpa.c
    +++ b/drivers/vhost/vdpa.c
    @@ -563,6 +563,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
    r = copy_to_user(argp, &v->vdpa->ngroups,
    sizeof(v->vdpa->ngroups));
    break;
    + case VHOST_VDPA_GET_AS_NUM:
    + r = copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas));
    + break;
    case VHOST_SET_LOG_BASE:
    case VHOST_SET_LOG_FD:
    r = -ENOIOCTLCMD;
    diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
    index 61317c61d768..51322008901a 100644
    --- a/include/uapi/linux/vhost.h
    +++ b/include/uapi/linux/vhost.h
    @@ -154,4 +154,6 @@
    /* Get the number of virtqueue groups. */
    #define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x81, __u32)

    +/* Get the number of address spaces. */
    +#define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int)
    #endif
    --
    2.30.1
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